Fuji Electric EW32EAG - Mccbs for DC Circuit Applications

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Selection and application
3-13 MCCBs for DC circuit applications
Table 3-27 MCCBs DC line up
Rated voltage Frame size
25/32 50 63 100/125 160 200/250 400 630 800
DC 125V BW32SBG BW50SBG BW63SBG
10/10 10/10 10/10
250V BW50EAG BW63EAG
"7%!1
BW100EAG BW160EAG BW250EAG BW400EAG BW630EAG BW800EAG
C2 C2 C2
2.5/2 2.5/2 5/3 10/5 10/5 20/10 20/10 20/10
BW32SAG
"73!1
BW50SAG
"73!1
BW63SAG
"73!1
BW125JAG
"7*!1
□
C2
BW160JAG BW250JAG
"7*!1
□
C2
BW400SAG
C2 C2 C2
2.5/2 5/3 5/3 15/8 20/10 20/10 20/10
BW50RAG BW63RAG BW125RAG
"72!1
□
C2
BW160RAG BW250RAG
"72!1
□
C2
BW400RAG
"72!1
□
C2
BW630RAG
"72!1
□
C2
BW800RAG
"72!1
□
C2
C2 C2
5/3 5/3 40/20 30/15 30/15 40/20 40/20 40/20
BW50HAG BW125HAG BW250HAG BW400HAG
"7(!1
□
C2
BW630HAG
"7(!1
□
C2
BW800HAG
"7(!1
□
C2
40/20 40/20 40/20 40/20 40/20 40/20
400V BW32SAG BW50SAG BW63SAG BW100EAG
-3P C4 -3P C4 -3P C4 -3P C4
2.5/- 2.5/- 2.5/- 5/-
500V BW400EAG BW630EAG BW800EAG
-3P -3P -3P
20/- 20/- 20/-
BW125JAG BW250JAG BW400SAG
-3P C5 -3P C5 -3P
10/- 10/- 20/-
BW125RAG BW250RAG BW400RAG BW630RAG BW800RAG
-3P C5 -3P C5 -3P -3P -3P
20/- 20/- 40/- 40/- 40/-
BW400HAG BW630HAG BW800HAG
-3P -3P -3P
40/- 40/- 40/-
600V BW125JAG BW250JAG
-3P CP -3P CP
3/- 3/-
BW 50SBG BW 63SBG BW 125RAG BW 250JAG BW 400RAG BW 630RAG BW 800RAG
-3P C6 -3P C6 -4P C6 -4P C6 -4P -4P -4P
10/- 10/- 25/- 25/- 40/- 40/- 40/-
BW 250RAG BW 400HAG BW 630HAG BW 800HAG
-4P C6 -4P -4P -4P
40/- 40/- 40/- 40/-
750V BW 400RAG BW 630RAG BW 800RAG
-3P CP -3P CP -3P CP
10/5 10/5 10/5
1000V BW 400RAG BW 630RAG BW 800RAG
-4P CP -4P CP -4P CP
5/5 5/5 5/5
Note: If there is no DC-specific model code such as “C2,” “C5” and “C6” at the end of the type description, a standard product can be used for both AC and DC. Only DC250V is indicated for
DC rating (DC125V is indicated for BW32SBG, BW50SBG and BW63SBG). For those adjusted to DC circuit, please specify “C2” (DC250V rating), “C5” (DC500V rating), or “C6” (DC600V
rating) at the end of the type description.
Upperrow:Type
Lowerrow：breakingcapacityIcu/Ics(kA)
The minimum
operating current at
DC is
about 110–140% of
that for AC.
The instantaneous trip
current is higher than
that for an AC circuit.
The rate of variation
depends on the
ampere-frame size,
rated current and
model. The trip
current can be as high
as 140% of the AC
value.
Instantaneous trip
characteristics
Inverse time-delay
trip characteristic
Trip
device
Operating
characteristic curve
Not applicable
None
Solid state
Operating characteristic changes for DC circuit application
Thermal-
magnetic
Hydraulic-
magnetic
AC
DC
Current
Operating time
AC
DC
Current
Operating time
3-13 MCCBs for DC circuit applications
While MCCBs are designed for an AC circuit, some may be
used in a DC circuit. The DC rating is cited in the catalog for
those applicable to a DC circuit. If a MCCB adjusted for AC is
to be used in a DC environment, the operating characteristics
will change as indicated in the table on the right. Therefore,
FAB adjusted for DC shall be used for a DC load. Further, due
to the absence of a zero-crossing point, it is more difficult to
break a DC current than an AC current in high-voltage levels.
Therefore, standard products cannot be used.
In such a case, it is necessary to use a breaker dedicated for
use with a DC high voltage.
ELCB cannot be used because it cannot detect leakage of DC
current.